Reenforced-thread expansion shield



July 3, 1923. 1,460,557

. J. E. OGDEN REENFORCED THREAD EXPANSION SHIELD Filed Jan. 11, 1921 s Sheets-Sheet 1 J. E. OGDEN REENFORCED THREAD EXPANSION SHIELD Filed Jan; 1 1. 1921 s Sheet-Sheet 2 July 3, 192:7.

J. E. OGDEN REENFORCED THREAD EXPANSION SH IELD Filed Jan. 11 1921 3 Sheets-.Sheet 5 some EDWARD oen'sngron MO NTAIN LLE, coRnwALnfimw was; 3

Patented July 3, 19Z3 I a l BEENFQRCED-TIEREAD EXPANSION SHIELD.

To all whom it coiwem:

Be it known that I; J OHN EDWARD Osman,

a citizen of the United'States-ofAmerica,

and a resident o'f Mountainville, town-of Cornwall, Orange. County, and State of New Yorlnhave invented certain new and useful Improvements in Reenforced 'lhread iEX- pansion Shields, of which the following is a specification.

This'invention relates to expansion shields which are used in combination "with lag screwsto effect a better securement of the lag' screws in various kinds of material.

Expansion shields ofgthis character are 'usu ally provided with a-tapered bore. theshield itself 'be'ing' in the form of 'acylinder. will therefore be seen that the thickness or depths of the walls-of the shieldvaries with the configurationor taper of-the bore." It is air object of my invention to improve devices of this character by so a'iranging the walls'of'th'e shield that great resistance shall v be offered to 'thewedging' and subsequently deformingaction of the lag screws as the latter are 'sc'rewedhomei'nto the-shield to firmlysecure the shield within the hole in which itisfplaced This and other objects of the invention are accomplished'by form ingfthe shield in accordance wi-th'the forms illustrated in the-accompanying drawings forming part of this specificationfand par ticularly described herein.

.Referring' now -to the" dra'wings, Fig. 1 is i an elevatio'nfof heli'cally' corrugated expansi'o'n shield which embodies one form-of the invention, there belngdong'itudinal 1ndentationspiinpressed I across the threads on and from the outside thereof.

1 th elineA L otfFi'ghre 3,

View "of the shield'sho'w F'gi. 5jis an'e'levfation of-a modified form of shield iii which thelongitudinalindenta tion's the threads are impressed therein r fromthe inside or 'bo rfe' ofthe'shieldfi shownin Figfa; and 1 Fig-7 is-a sectional eievatiosth re f taken Fig. 6 is a bottom'pla'nviewbfthe shield- :Figs. 8 9 are views similar'to Figs. '3-

a-I'Id 6" respectively; showing CllVISlOl'L' Applicatiomfiled January 11,1921. Serial No. 4363192.

plane or line of. the shields atthe "right 'angles tothat shown in those figures. a v

' Fig 10 is an elevation of arniodified form of the invention in;which*'pa rtof-the exterior wall of the shield comprises triangular sections of sheet metal'extending from the bottom of the shield upwardly, the sections being "bent back (from the V divisional edges thereof and longitudinally indented.

'1 ig. 11 isaiplan view of the hi ld. Shown in Fig4fl0; I

bore being and Fig 1 3 isan-elevationof one of thi secv -ti0ns making up: the shield, the view: being .takenon theline 13-'13of'Fig;

; as i Fig; l2'isa bottom'planiview,thereofl'the shown as of hou1"g lass..7"-=form 1 Fig. 141M- View similar to' Fig-.12 but showing a modifiedform ofiboreii I Fig. 15' is anelevation of another-modified form of. shield showing exterior fingers extendingfrom theedges o'fzthe segments and i havingtheir tips folded back and-down "into;

shown inFig; 15f: A s

--Fig-. 17' is a view similar-toig'. l6,'-but and bent'back. under the fingers. a

showingthe tips 'ofthe fingers as extended a Finn, 18-is view similar to Fig. 16,

showing the finger. tipsFig. "17 as Fig.1 19-is an elevation of amodiliedioini of shield inwhich thelfingers .pfiFig.- 15 are bent to lie within'the bore of the shield-in the outsidethereof as Figl stead of on "Fig. 20 is a bottomview' of -the shield shown in Fig. '19. 3 1:

I Fig. 21 is an elevation of form I i of shield in which is combinedthe triangular' sections ofnFigl 10 and the rfingers' of Fig. 15. i Ii' a Fig. 22 is a bottom shown in Fig. 21 a a a Fig; 23 is a View similar to Fi'gfi22fbut.

showing the tips of the fingersas extendecl- Fig. Qlis an elevation o'f'a modifiedfoin'i;

i of shield in which partiof theexteriorvwall of the shield comprises ftria-ngulansections of sheetf'metal extendingifrom the bottom of the shield upwardly the" sections being bent back'from bottom of 'theishield inf thebottoms of the vhelicalcorrugations. Fig.16 is a'bottom plan-view ofthe shieldasses stead of from the divisional edges thereof as in Fig. 10 and transversely indented.

Fig. is a bottom plan of the shield shown in Fig. 24;

Fig. 26 is an elevation of one of the sections making up 7 24, the view being taken on the line 26-26 of Fig. 25, and

Fig. 27 is a transverse section taken on the line 2727 of Fig. 26.

Fig. 28 is an elevation of a shield which differs from that in Fig. 24 by having its triangular sections bent backward from its divisional edges instead of from the bettom of the shield as in Fig; 24;.

Fig. 29 is a bottom plan view of the shield shown in F ig'; 28.

Fig. 30 is an elevation of a shield which differs from that in Fig. 21 by having transverse insteadof longitudinal indentations.

Fig. 31 is a bottomplan view of the shield shown in Fig. 30.

Fig. 32 isra view .similar to Fig. 31 but showing the finger tips as extended and folded under.

' ,-L1ke characters of reference designate corresponding parts through the drawings.

4O designates a tubular shield of stamped or pressed metal of substantially uniform thickness,.either divided longitudinally throughout the greater part of its length along lines which are preferably inthe same plane, or else divided throughout its entire length wherebyindependent cylindrical segments are formed, the segments being maintained in axial alinement by any suitable I means as by a spring wire 41 seated in a groove 11. in the segments. The exterior of the shield is a cylinder whilst-he bore is tapered from the outer to the inner end thereof. .The bore in cross section is preferably not circular but has constricted portions preferably at diametrically opposite points. ",The bore is provided with threads 42 of a pitclutoreceive a lag screw. These threads are'helical corrugations which vary 1 in depth sufficiently to ma'ke the exterior wall of the shield cylindrical.

The shield preferably comprises two symmetrical segments. the plane of division be tween the segments being indicated throughout. the several views by the line (4-6. WhileI prefer to make the bore of the shield of substantially elliptical form and to divide theshield along the major axis of the ellipse I may as indicated in the drawings,

divide italong therninor axis thereof and make. the bore of hour glass form without departing from the spirit of the invention. Furthermore it will be understood that while I'have shown the shield as'divided into two symmetricahsegments, it may be composed of a further plurality of symmetrical seg ments without departing from the spirit of the lnvention. i

the shield shown in Fig.

Referring now more specifically to Figures 1 to 9 of the drawings it will be seen that the shield is provided with helical cor rugations 42 which begin a short distance from the top or outer end of the shield and extend throughout the length thereof. In view of the fact that the bore of the shield gradually decreases in cross sectional area from the outer to the inner end thereof the corrugations likewise vary in depth, being of maximum depth at the bottom or inner end of the same. \Vhen the bore has a major and a minor axis, the wall of the shield will thus be of minimum depth or thickness on the major axis of the bore as indicated at 43 and of maximum depth on the minor axis thereof as indicated at 44. The deeper parts of the shield walls are provided with longitudinally, extending indentations 45. These indentations lie across the threads. or

corrugations, and gradually increase in the shield while in Figs. 5 to 7 and Fig. 9 F2.

they are shown as impressed in the screw threads withinthe borelof the shield. 'lVhen theindentations are impressed from the outside toward thebore of the shield the depth of the same is such that they will not intere fere with the free passage ofthreads of the lag screw, or in other words the indentations are not deep enough to form obstructions against the entry of the lag screw which, as has been pointed out, is threaded into the bore of the shield to expand the same. WVhen the indentations are impressed into the corrugations from the inside of the shield they are preferably no deeper than the depth of the lag screw threads. upper. noncorrugated part of the shield is preferably provided with outwardly extend ing indentations, 46 which serve to prevent rotation of the shield when the lag screwis initially turned in the bore of the shields In Figs. 8 and 9 I have shown that the plane of division of the shield may be on the major instead of on the minor axis ofthe bore thereof without departing from the spirit of the invention. p

In Figs. 10 to 14 I have shown a modified formof the invention.v The boreof the shield,-as in the previously-described forms of the invention, is helically corrugatedv to form screw threads to receive a lag screw. The cylindrical fOIIIl'Of-illflfl shield, however, is obtained not by .increasingthe depth of the corrugations at either side of the minoraxis 'of the borebut1by folding over from the longitudinal edges of the segments of the shield, triangular sections 47 of the sheet metal. Into these sectionsare impressed ilon gitudinally extending indentations 45, preferably (a plurality thereof as shown, Fig,

The v 2, s'ho'w eb r u as o 1 1 g ass rm i andin an illustration of joneof thejtorrns the bore mayheve in aIl df-the Inodifi ee tio'ns" f th in j fid s'w tho spirit of theinventi'on I H q In Figs. 15 to 1831 have shown another i e ike proj nsfle i t m k 1 1 part ofthe cylindricalw'vafiof the ,shield; These fingers extend radially from the bot tom 10f the exterior 'corrng'ati on's'inntil 'flthe y in ri iam e jo esh i f t i d and t bents v l ntil heir tips'i' e t i th meof the omie t n .a c erly illustrated in Fig.- 16.21111 Fig. 17 I have shown the fingers 48 as provided Wither hown further development of" my invention; .The long-i f ,tudinajlly indented triangular sections 47-" (Figs 11 o1 1= e P ov d w h fi 4 hich ext f m t e. hypotenus d i of the triangular SeCti nsTand-hQVe'their tips restingi'n' the bottoin' ofthe c'orruga j tions. In '23 Ihaves'hoivn the tips'a s somewhet longer end .henthack and imder the fi ge si i elf o h r n men h w in Fig. 17'. I; v 1 fl I In Figs. 24t0 27' IFhtWe shownfhe tri angular sections 47 as being bent'iipTfro ii the bottom {or innerendof the shield instead offrorn the division'al edges'thereof. As a further modification oi mytin ventionl have" showjn these triangular sections 'as indented v transversely instead of "longitudinally.-

These indentations 'in thdormtt helical corrugations A9 corresponding in, piteh to gradually increase; in depthffro n the enter to the; inner gend of (the shield heing'e t it mani nnm at the bottom oi'finnenend thereof. It Will be nnderstoodithat the exterior} of the shield is cylindriezil, as inthe other modifications. .The roots;51 .of these helical indentations rest "in -;the depressions 52' formed in thennderlying shield well'by the" screw threads42of the bore; v indentetions' 49 may be incorporated intov triengiilar-section's 47 which are bent oye'r from I the divisional edges o-fffth'e shield, v have shown such construction,in Figs. 28"

and} 29; It ill ,otcoursebe understoodithat the divisional edges i'n this. coiistriiqtibh will" i d pe n from e these fingers rest in the hottoni'siofvthe "de v pressi0ns52 formedhy the threg 'd' back and" under thetriangulassecfii and" i n; the thread 424i i n which havebe'en'shown; theficonstm; on s sueh that there. is e an ex ess ofjm'ettil 6111 the bottom or inner endoflthefshieldgithis "e ces -t slich that it"hasiag plurztl-ity of axes 'ent length. Inasnineh esthe eXt'er mfthe shield is cylindrical in form-it follows thet Q the thicknessjof the shield' fromth'e insideto' ness .pn the *exis o'f greatest length and "least' thiclmess'on theiexis a--shbrtest1 ngt I desirable collapse 'ofth Walls offthe shield,indentgti nshave heeir'p'royided; for the purpose;ofstiflenin lso bee'euselthe tendeney iforthe shield to edges dot -the :v sh'i' 11 not fappear as "a cell-like" a1 i'zi-Irgement {but will appear as e c'losed' triaiiguler watll hetween thebore endexteri'or cylindrical snr- Y fa'c'eof the shield'as clearly-shown in- Fig;

FigsBO,and -3Ishow the'eansversti dented triangular sections as provide" laterallj iext'en'ded fingers 4 8"... The tip e ips 5 2" shOWs' the fingers ag haying lying in the hottoin "'of -thef delinessi j all of the forins of expansion or materia gradiiellyJdeoresising towardifthe; 1

the" biitside thereof different zit fdif ferent perts of thesaine', heing efles's thick? the? e'orruge,tions: j The'se indentations are prefQrabIyKerrengedfin: peirs on either side s.

eithe 100 H i of the minor ariis of the bore "either I 1 ou side oftheshield .or'on theinsfide thereof: esfshow in Figsi l to 9; f This constructijonmajkes fpossjible" affirrn seeurernent of fthe V g 'atstfdepth' will=stend up"l nder the Wedg v v I N ingestion of theQlag' screw and only 'be} thethreads 42 of Ltheboie; j "A's 'shown t'he'y gradiia'lly; defor ed thereby a ithe same: issrejived home. The pi" vision of longitud'i' advantageous not 1 only;v becau e it serves 5 to very mat riall st-i ff'e'n the 's'heetif metal} but '1 rotate about its axis is "obviated-,1 ThetrahsL n5 7 nal indentations in theftriztngulariseetiensis I 126 .I' v r ei o mga id i i s d ee n e ePr manly to stifi'en the material: a 1111.; those v. V. forms whereim the' triangu'lariiseet-ions are,

fIn'prde'r toinake clear thtttlthetrensverse While Ihaveshown and described my in vention as capable oli' embodiment ina nn nber oiflforms gi't will be underStOOd thatthe showing is merely illustrative :of the inven tion andis not to be taken as a limitation thereof; Reference is'to be had to the appended clainis for thescope oifltl einvention;

TWhat I claimisi v p Al tubularl expansion shield having Walls ,of substantially uniform thickness which are. helicall-y corrugated tot form a threaded bore, said here being,.gradually constricted in at least one plane which in eludes the axis of; the shield and rein-lore ing open bends ,in the metal near the plane of said constriction. k j s 2. tubular yexpansion shield, having walls of substantially z uniform -thicl nes s Wl'llClljZLIQ- hBllCELllY c o-rrugrated to form :a threaded bore, said bore being gradually constricted in at least one plane which in eludes I the; axis of "the tube, and reinforcing, corrugations in the metal near the plane of said constriction. 1 I

3. A tubular, expansion shield} having Walls of I substantially uniform ;.tl.i icln ess whichv are vhelically corrugated to, form a threaded.bore, the outer-parts of the shield; lying in a. cylindrical s urface, said "core beingv gradually: constricted in at leastgone, plane ,Which includes the axis ofthe tuhe; and reinforcing corrugations inthe metalnear the said plane-or planeswherethe dis tancehetrgeen the outer parts of the shield and the here is greatest. v R i I APA- tubular" expansion shield having alls of substanti ally uniform f..thickness},. said; shield being longitudinally diyided throughout at least za part of its length; and helically.:corru ated-to Qf'orm a; threaded bore the outer "partseof the shield lying, in atcylindrical surface, said-bore being .gradually constricted in at least v one plane which includes ;theaxis of the tuloe and reinforc'-' ing-corrugations in the metalnjear the said plane on planes Where; the distance between the outer parts of the shield and the bore is: greatest. I Z 5. Avtubular expansion. shieldhaving wallsi of. substantially uniform thickness with the outer-part's'thereot lying in a cylindrical. surface, said f shield being longitudi v n'ally dividedthroughout at leasta gpart o l, its length and helieally corrugated to vform a threaded bore 'with fithe threads thereof. gradually increasin'gin depth-from theouter to 'the iinneri'e'ndlzol the shield-. in atleast;

one plane which includes the axis ,of fiche tube and to *a greater extent than in planes;

removed therefrom; and,- r'einforcingopen bends in the. metal .f'near the said ip'lane or: planes of maximum increase in depth of the threads.. 6.:A'n expansionshield compr sm'g. a plurality of cylindrical sections which together form a tubulardevice, the walls of each sectionbeing of substantially uniform thickness and helically corrugatedto form parts of a threaded bore, said corrugations gradually increasingin depth lrointhe outer to the inner end of thes'ection and to .a-greatr degree at the edges of the section than at lines intermediate theedgGS and each sectionlha'ving reinforcing; open bendsfnear saidedges. 7

A tubulargexpansion shield of sheet 7 metal helically corrugated to form a threaded bore saidiboieloeing gradually constrict-f ed, in. at least]: one plane which includes the axis "of the shield; and reinforcing open bends-in the metal near plane of said constriction} i a i, ,Y 8. A) tubular ,expansion shield of sheet metal helically'cormigated tofoi m a thread{ ed boreQthe outer ,parts- O-flthe shield lying 1111a cylindrical surfacefsaid bore being graduallyv constricted in at. least onefplane' .hich includes the axisof the tube, andreinforcing corrugations in the metal near the said plane or planeswhere the distance hes tweenfthei outeri parts i of the shield and the be ei s eat stf 9. A tubular expansion, shield of sheet metal with the outer parts thereof lying ina cylindrical surface said shield being longitudinally divided ithroughout at least a part of ,its; length and helically corrugatedto forrn athreaded bore with the threads there of gradually]increasin9; in depth from the outer to thefinner endof the" shield in at least I one *plane hich includes: the axis of the tube and to a greater extent than in planes remoyed v therefrom, and reinl'orcin; open bends in'the metal near the said plane or planes of maximum increase in depthof the threads. v N

- 10. .An expansion shield comprisingaplu rality' of: similarsections of sheet m etal tonether; forming-a tubular device. each sec- 1 tion being helically corrugated to, form parts of "a threaded bore; said corrugations grad;

uallyincrea'singjn depth fromthe outer to the inner end oi the section and to a-greater degree at ,the'} edges thereof than on lines intermediate theedges, and each section hay; ing reinforcing, open bends near said edges; 7 11., An expansion shield of sheetmetal in the form of a cylinder having a bore of grade ually decreasing cross sectional .areanhelical corrugations of constant pitch vbut increasdepth'inithe alls'ofthe shield, and: reinforcing, indentations extending :trans versely across the corr'ugations.

a 12.; An expansion shield of sheet metal in thefit'orm of a cylinderhavin ga bore ;-of; gradually decreasing cross sectional area, helicalycorrugations of constant pitch but increasing; depth in the Walls of .the shield; andgr'einitoreing indentations in the corruga-v s xt nding l ngitudinally of, the shield,

13. An expansion shield of sheet metal in the form of a cylinder having a bore of gradually decreasing cross sectional area, helical corrugations of constant-pitch but in-. creasing depth in the 'walls of the shield, and

- reinforcing indentations in the corrugations extending longitudinally of the shield, said indentations gradually increasing in depth.

14. An expansion shield of sheet metal in the form ofa cylinder having a bore of gradually decreasing cross sectional area,

helical corrugationsof "constant pitch but increasin depth in the Walls of the shield, and reinforcing indentations in the corru gations extending longitudinally of the shield, said indentations gradually. increase ing in depth in proportion to the increase in depth of the corrugations. I

15. An expansion shield of sheet metal-in the form of a cylinder having a bore of gradually decreasing cross sectional area,

helical corrugations of constant-pitch but increasing depth in the Walls of the shield, and reinforcing indentations in the corrugations extending longitudinally of the shield,

said indentations gradually increasing in width and depth and being of greatest Width and depth on :the corrugations of greatest depth.

16. An expansion shield of sheet metal in the form of a cylinder having a bore of gradually decreasing crosssectional area,

helical corrugations of constant pitch but increasing depth in the walls of the shield, and reinforcing indentations impressed in the exterior corrugations of'the shield.

17, An expansion shieldof sheet metal in the form of 'a cylinder having a bore ofgradually decreasing cross "sectional area,

and parallelly extendin indentations .in the 19. An expansion shield of sheet metal in the form of a cylinder having a'bore of.

the corrugations in the loore of the shield graduall in proportion to the increasingdepth in the corrugations in formingthreads to len h of the shield.

points near the maximum depth gradually decreasing-"cross sectional area, helical'corrugations of constant pitch but increasing depth in the'walls of the shield, and indentations in the shield extending transversely across the helical corrugations;

20.'-An expansion shield of sheet metal in the. form of a cylinder having a bore of gradually decreasingcross sectional area, helical corrugations in thewalls of the shield of constant pitch but increasingdepth, and indentations in the shield extending across crease of the depth of the corrugations.

21. v the form. of a cylinder having a bore .o'f gradually decreasing cross sectional-area, hehcal corrugations in the. walls'of the shield of constant pitch but increasin across the helical corrugations'atpoints, on

An expansion shield of sheet metal-in the helical corrugations, "said. indentationslncreaslng indepth in proportion to the inp n parallelindentatlons in the shield extending.

either side of the major axis' of the shield. i

22. An expansion shield of sheet metal i'n the form of a cylinder having a bore-of gradually decreasing cross sectional area,- helical corrugations of constant pitch but increasing depth in the Walls of the shield,

of the shield" forming threads to cooperate with a lag scr'ew,and longitudinally extending inden-' g tations in thecorrugations onYtheoutside teripr threads are. of tudinally of the length of the shield.

y increasing. in depth, depth. of the corruga-"f i tions whereby certain portions lot the 1n-' constant depth longi- 23. An expansion shield of sheet'metal in' I the form of a cylinder havingla bore of gradually 1 decreasing cross sectional area, hellcal' corrugations of constant pitch but the boreofthe shield cooperate with a lag the Walls Of the shield,

screw, and longitudinally extending inden- 3 H 2 tati'ons impressed across the corrugations Wherebycertain portions of the-threads are of constant depth longitudinally of the witnessvvhereoflxl hereunto set hand this 'lth day of J any, 1921.

"Witness: Q I. B. Moons.

y. JOHN EDWARDOGDENK f; 

